Technical Aspects: Focus, Shutter
Speed, Aperture and ISO
Exposure Mode
Use Manual Mode
on the Exposure Dial.
Night Photography is a particular problem for your
camera's auto settings. Even Aperture Priority and
Shutter Priority modes can get confused by the difference
between the dark sky and the subsequent illumination
of bursting fireworks. It's just best to control all
the exposure functions of the camera yourself. The
following guidelines will show you how to set your
camera for night photography.
ISO
Since high ISO's cause digital noise
(in film it's called graininess), you want to keep
the ISO pretty low, about 100-200.
Image Stabilization
Image Stabilization (IS for Canon)
or Vibration Reduction (VR for Nikon) can save your
photos when you're shooting handheld at slow
shutter speeds. But when it comes to shooting night
photography on a tripod, this technology can cause
inexplicable blur. Make sure to turn it OFF.
Blur explained.
Focus
You will notice that focusing the
camera at night is very, VERY difficult. At night
the camera's autofocus will help you miss lots of
great explosions. If you know where the fireworks
are coming from, pre-focus on something on that same
Focus Plane. Once you set the focus, shift the focus
mode to Manual Focus (M or MF, on
the lens barrel for Canon and Nikon).
This will keep your auto-focus from
trying to engage when you try to take your photos.
Since your digital camera has the ability to review
our images and magnify the photo to check for focus.
Use these tools. During your shooting, make sure to
check your images for focus. There's no bigger frustration
that coming home excited about your new photos and
finding that they're out-of-focus. Check Focus, Check
Focus, Check Focus.
Shutter Speed
Your shutter speed will be governed
by the duration of the fireworks. Remember, in order
to get a complete bloom, the shutter has to be open
from before the firework is launched through to the
final traces of the "flowering". Shutter
Speeds will generally be around 8-10 seconds.
This number can be changed as you discover that your
exposures are too long or too short.
The display in your camera will show
seconds with quotes; 10" is ten-seconds.
Alternately, when the display shows 1/10
or 10 your exposure is set to one-tenth of
a second. You'd be surprised at how much this little
tip can alleviate frustration.
Aperture
Since the duration of the firework
governs the Shutter Speed, I use Aperture to control
the overall brightness/darkness of the image.
Try starting at f/8.
If the photo is too dark, "Open
Up" the aperture (smaller f-number), this will
allow more light into the camera making the images
brighter.
If the photos are too bright, try "Stopping Down"
(larger f-number).
Where's that Lens Cap Go?
Since you'll be shooting in the dark,
finding stuff that you drop becomes difficult. Make
sure to put your lens cap somewhere you can find it;
your pants pocket (every time) or in your camera bag.
Carry a flashlight, it may be the difference between
having a wonderful evening and going insane.
Practice these techniques before the
big event. Find the camera, charge the batteries,
make room on your memory cards and dust off the tripod.
Shoot night photography around the neighborhood and
find out what works. Practice makes perfect.
If you need more help learning about
your camera and would like to take a class, you'll
be happy to know that we have regularly-scheduled
classes every month.
Visit http://www.IlluminateWorkshops.com
Happy Independence Day and Happy Shooting,
Efrain Cruz
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